Home >Documents >From Topology Optimization to Robust Design Optimization

From Topology Optimization to Robust Design Optimization

Date post:04-Jan-2017
Category:
View:221 times
Download:1 times
Share this document with a friend
Transcript:
  • From Topology Optimization to Robust Design Optimization

    Dipl.-Ing. Markus Kellermeyer, CADFEM GmbH

  • Robust Design OptimizationRobust Design Optimization

    2

    Outline

    1. Overview for Optimization in ANSYS Workbench

    2. Project Description

    3. Topology Optimization insideANSYS Workbench

    4. Robust Design Optimization with optiSLanginside Workbench

  • Robust Design OptimizationRobust Design Optimization

    3

    Overview for Optimization in ANSYS Workbench

    TopologyOptimization

    optiSLanginsideWorkbench

    optiSLangwith optiPlug

    Easy-to-usetool for difficult& nonlinearoptimizationtasks, robustnessevaluation and robust designoptimization

    Advancedtool for alltasks

    Parameterfreeoptimization

    Parameter optimization

  • Robust Design OptimizationRobust Design Optimization

    4

    Example for Topology Optimization: PowerWind GmbH

    6 different loadcases were considered

    by courtesy of PowerWind GmbH

  • Robust Design OptimizationRobust Design Optimization

    5

    Project Description

    Create a design within a predefined space, that

    - consists of beams with predefined cross section profiles- where the beams do not exceed a predefined stress- where the 1st frequency will be as large as possible- where the structure will be a 2- design or higher due to appearingstresses

    ???

  • Robust Design OptimizationRobust Design Optimization

    6

    Topology Optimization

    Steps to do topology optimization with several load cases:

    loadcase1

    loadcase2

    Define several load steps

    These will represent theloadcases

    Run Macro Solve

  • Robust Design OptimizationRobust Design Optimization

    7

    Topology Optimization

    Use Topology Optimization in Workbench Several load cases can be considered: a one-click-solution

  • Robust Design OptimizationRobust Design Optimization

    8

    Topology Optimization

    Use topology idea, to create a manufacturable concept:

    Parameterize the beam structureto allow different design constellations:

  • Robust Design OptimizationRobust Design Optimization

    9

    Topology Optimization

    Whats been done so far:

  • Robust Design OptimizationRobust Design Optimization

    10

    Robust Design Optimization with optiSLang inside Workbench

    General Information:Dynardo integrated optiSLang in ANSYS Workbench as an easy-to-use tool.Its called optiSLang inside Workbench

    It will be used for the Robust Design Optimization Workflow

  • Robust Design OptimizationRobust Design Optimization

    1-sigma level

    3-sigma level

    11

    Robust Design Optimization with optiSLang inside Workbench

    Sensitivity Analysis:

    Input1 Input2Input3 Input4 Input5 Input6Input7

    Robustness Eva.:

    Input1 Input2Input3 Input4Input5 Input6Input7

    Constraints

    Robustness Eva. 2:

    Input1 Input2Input3 Input4Input5 Input6

    Constraints

    Optimization:

    Input1 Input4

    ObjectivesConstraints

    Input1 Input4

    Optimization 2:

    Input1 Input4

    ObjectivesConstraints

    Input1 Input4

    Modify Constraintsfor a new

    Optimization

    General Workflow:

  • Robust Design OptimizationRobust Design Optimization

    12

    Robust Design Optimization with optiSLang inside Workbench

    General Workflow in ANSYS Workbench:

    Step1 Step2 Step3 Step4 Step5

  • Robust Design OptimizationRobust Design Optimization

    13

    Robust Design Optimization with optiSLang inside Workbench

    Step 1: Sensitivity Analysis - Setup

    1. Definelower & upper bounds

    2. Define numberof samples

  • Robust Design OptimizationRobust Design Optimization

    14

    Robust Design Optimization with optiSLang inside Workbench

    Step 1: Sensitivity Analysis - Results

    Important parameters: split2, split3, split6

    Stress:Deformation:Frequency:

  • Robust Design OptimizationRobust Design Optimization

    15

    Robust Design Optimization with optiSLang inside Workbench

    Step 2: First Optimization

    Just choose an algorithm.The decision tree helps!

    Define constraints & objectives: < 43.5d < 0.17frequency max

    Parameter setting

  • Robust Design OptimizationRobust Design Optimization

    16

    Robust Design Optimization with optiSLang inside Workbench

    Step 2: First Optimization - Results

    Stress = 40.87 < 41.5 (limit)Deformation = 0.169 < 0.17 (limit)1st Frequency = 27.9

  • Robust Design OptimizationRobust Design Optimization

    17

    Robust Design Optimization with optiSLang inside Workbench

    Step 3: Robustness Evaluation with optimized design

    The current sigma level for this design is: (41.5-41.16)/0.242 = 1.4

    not good enough

  • Robust Design OptimizationRobust Design Optimization

    18

    Robust Design Optimization with optiSLang inside Workbench

    Step 4: Second Optimization with changed constraint

    Define new stress constraint: < 41.2d < 0.17frequency max

    Stress = 39.0 < 41.5Deformation = 0.168 < 0.171st Frequency = 27.8

  • Robust Design OptimizationRobust Design Optimization

    19

    Robust Design Optimization with optiSLang inside Workbench

    Step 5: Robustness evaluation with second optimized design

    Now, the sigma level is > 2

    ok! optional: 3rd run withinterpolated stress-

    constraint

  • Robust Design OptimizationRobust Design Optimization

    20

    Conclusion

    Topology Optimization good for finding a concept

    90 min

    20 min

    5 min

    10 min30 min

    5 min 5 min 5 min 5 min

    Parametric Optimization good to work with manufacturableparameters and in more than 1 physics domain

    Robust Design Optimization can now be done inside Workbench in a very quick way: optiSLang inside Workbench

    easy-to-use tool, that safes time for the user:

    setup-time

  • Robust Design OptimizationRobust Design Optimization

    21

    Thanks for your attention!

of 21/21
From Topology Optimization to Robust Design Optimization Dipl.-Ing. Markus Kellermeyer, CADFEM GmbH
Embed Size (px)
Recommended